package com.mashibing.juc.c_006;

import java.util.concurrent.CountDownLatch;

/**
 * @ClassName T01_CountDownLatch
 * @Description 闭锁   倒数机制
 * @Author xiongwei.wu
 * @Date 2021/7/12 11:39
 **/
public class T01_CountDownLatch {
    public static void main(String[] args) {
        usingCountDownLatch();
//        usingJoin();
    }

    private static void usingCountDownLatch() {
        Thread[] threads = new Thread[100];
        CountDownLatch latch = new CountDownLatch(threads.length);
        for (int i = 0; i < threads.length; i++) {
            threads[i] = new Thread(() -> {
                int result = 0;
                for (int j = 0; j < 10000; j++) {
                    result += j;
                    //执行-1操作 100-->99-->98-->97-->96
                    latch.countDown();
                }
            });
        }

        for (int i = 0; i < threads.length; i++) {
            threads[i].start();
        }

        try {
            //阻塞
            latch.await();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        System.out.println("end latch");
    }

    private static void usingJoin() {
        Thread[] threads = new Thread[100];

        for (int i = 0; i < threads.length; i++) {
            threads[i] = new Thread(() -> {
                int result = 0;
                for (int j = 0; j < 10000; j++) {
                    result += j;
                }
            });
        }

        for (int i = 0; i < threads.length; i++) {
            threads[i].start();
        }

        for (int i = 0; i < threads.length; i++) {
            try {
                threads[i].join();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }

        System.out.println("end join");
    }
}
